Imagine you are an astronomer who recently discovered a new planet orbiting a distant star.
Which set of characteristics would you use to classify this planet as an inner or terrestrial planet? Check all that
apply
dense and solid
very large
thick atmosphere containing hydrogen and helium
lacking a solid surface
located near a star
1) Intro
Done

f=ma newton's second law 7x8=56n

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.